Eutrephoceras dekayi with Hoploscaphites- Pierre Shale, Montana | River Walkers Minerals Phantom quartz allowing light to illuminate its

allowing light to illuminate its internal structure while highlighting the crisp cubic form

Fine boulangerite inclusions within the fluorite add another layer of interest

and elestial triangles catching the light from different angles

This is not just a mineral specimen—it’s natural sculpture

Please review all photos and videos carefully to see the exact quality and condition of this specimen before purchasing

Eutrephoceras dekayi with Hoploscaphites- Pierre Shale, Montana | River Walkers Minerals Phantom quartz allowing light to illuminate itsLocale: Pierre Shale Formation, Glendive, Montana, USA Age: Late Cretaceous (~7080 million years old) Dimensions: 1045g, 5 x 4. 5 x 3. 2 An impressive natural association from the famous Pierre Shale of eastern Montana, this specimen features a large Eutrephoceras dekayi preserved in matrix alongside several smaller Hoploscaphites ammonites and numerous marine shell fossils. The dark shell of the nautiloid contrasts beautifully with lighter calcite